I've just chatted with Keith Packard on this.
This interface (an ioctl that blocks) isn't a good one.
How about a signal when vertical blanking arrives? (1st choice) That, or
something we can select on? (2nd choice)
- Jim Gettys
> Sender: [EMAIL PROTECTED]
> From: Michel =?ISO-8859-1?Q?D=E4nzer?= <[EMAIL PROTECTED]>
> Date: 01 Nov 2002 22:01:46 +0100
> To: [EMAIL PROTECTED]
> Subject: Re: [Xpert]But *why* no vblank?
> -----
> On Fre, 2002-11-01 at 21:10, [EMAIL PROTECTED] wrote:
> > Yes, XSYNC has the right things to allow applications to synchronize
> > on arbitrary things (including vertical sync).
> >
> > If the fbdev and/or DRI folks are willing to support and export an
> interface,
> > it should be possible to get the plumbing hooked up.
> >
> > Just make it a file descriptor we (and/or other things) can select against,
> > and it should be something that can be pretty cross platform without much
> > trouble: them's that don't implement it on a given platform won't get
> > support...
>
> The interface we've implemented in the DRM is an ioctl which basically
> blocks for a requested number of vertical blanks (it's more flexible in
> fact). Maybe a daemon or something could provide a file descriptor to
> select against?
>
>
--
Jim Gettys
Cambridge Research Laboratory
HP Labs, Hewlett-Packard Company
[EMAIL PROTECTED]
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